Shutter mechanism for cameras



May-12, 1942; L. 'r. JOHNSON ETAL 2,282,869

SHUTTER MECHANISM FOR CAMERAS I Filed Nov. 10, 1941 3 Sheets-Sheet l-Ay/e 71/029778 Fag 1770276257. c/e/vsefi INVENTOR ATTO R N EYS WITNESSy' 9 L. T. JOHNSON ETAL 2,232,369-

SHUTTER MECHANISM FOR CAMERAS Filed Nov. 10, 1941 3 Sheets-Sheet 2 Lyle71/06'275 027 fiayma/mfl J6 ATTOR N EYS WITNESS May- 12, 1942. L. T.JOHNSON El'AL 2,282,869

SHUTTER MECHANISM FOR CAMERAS I Filed Nov. 10, 1941 3 Sheets-Sheet 3 I I5 I V 2 l 2/ l5 2a 120 i z I z I, 2, W151 2. 23

33 Isl 3a I a w all . ,1 34 4 ['g Z /0%I7 $0/7 INVENTORS WITNESSES- yA1TDRNEYS Patented May 12, 1942 UNITED STATES PATENT OFFlCE azaaaccsnu'r'rsa MECHANISM ron cmms Lyle '1. Johnson, Madison, and Raymond A.Jensen, Menomonle, Wis.

Application November 10, 1941, Serial No. 418,564

4 Claims. (Cl. 95-31) construction and combinations of parts hereinafteriully described and claimed, it being unfocusing apparatus constructedin accordance with the invention.

Figure 2 is a longitudinal sectional view taken on the line 2-2 ofFigure 1 showing the thread ed focusing ring,- slides moved by the ring,and box plate holder carried by the slides.

Figure 3 is a longitudinal sectional view taken on the line 3-3 orFigure 2 showing the guides and supports for the, box plate holder.

Figure 4 is a. rear elevation of the camera shown in Figure 1.

Figure 5 is a front elevation of the camera shown in e l.

Figure 6 is a cross sectional view taken on the line 6@ of Figure 2showing the guides.

Figure 7 is a cross sectional view taken on the line 1-1 of Figure 6showing the slides, the guides and the focusing threadedly engaged ring.

Figure 8 is a cross sectional view taken on the line 8-8 of Figure 2showing the guides, supports, and the box'filn. holder carried by thesupports.

Figure 9 is a cross sectional view taken on the line 9-9 of Figure 2showing the slides in rear elevation.

Figure 10 is a vertical sectional view through the plate holding boxtaken on the line ilk-I0 of Figure 3.-

Figure 11 is a horlzonal sectional view of the plate holding box takenon the line ii-il 01' Figure 2.

showing the reflecting type camera equipped with a box film holderinstead of a box plate holder,

Figure 13 is a cross sectional view taken approximately on the line i3l3of Figure 12.

Figure 14 is a detail cross sectional view taken on the line M ll ofFigure l2.

Figure 1c is a vertical sectional view of the Wright reflector typecamera showing the film holding box disposed in an opening in thecorrection lens.

Referring now to the drawings in which like characters or referencedesignate similar parts i in the various views, i0 designates a cameraof the Schmidt type or similar reflecting type, having a reflectingmirror ii at the back for refleeting the image to a holder for out filmor a plate intermediate the front and rear of the camera and hereafterreferred to as a plate holding box.

In carrying out the invention a focusing ring i2 is mounted in anannular slot formed in the body of the camera near the front end or thecamera and is threadedly engagedwith a pair of diametrically opposedrectilinear slides i8 which are disposed on respective guides i4 securedto the inner wall of the camera. The focusing ring is marked withgraduations i5 and a pointer i6 is marked in the body of the camera, seeFigure 1..

In the form. or the invention shown in Figures l to 11 inclusive 9.plate holding box it is disposed on the axis of the camera and issecured to the slides II by supports i], which may he formed of thinflat bars, see Figure 3. By

turning the focusing ring ii the slides are moved endwise in the cameraand carry with them the box IE which latter is shown in detail inFigures 10 and 11.

The box Ii includes a holder l8 for cut film or a plate l9 and alsoincludes rollers 20 for a shutter curtain 2| of the type having slits ofvarious sizes which are interchangeably disposed in front of the platein accordance with variations or light, as is well known. The shuttercurtain is wound on take up and pay off rollers 22 and is guided overrollers 23 to dispose the shutter curtain in front of the plate, seeFigures 10 and 11. However any one of the various types of focal planeshutter, such as the one with a single curtain, or the one with twocurtains and an adjustable slit, or other type, may be used in the twoconstructions herein described, that is with plates or roll film.

Figure 12 is a detail vertical sectional view For inserting and removingplates a door 24 25 is adapted to support the shutter apron aspreviously described, and hereinafter more fully described, but ismodified to hold roll films as will now be described.

The box 25 is provided with a pair of inclined film rollers 26 overwhich the film 21 is trained for delivery to a film holding roller 28,see Figure 12 which is disposed in rear of light shields 2 and a guide29 for the shutter curtain 30 of the type previously described, in thepresent embodiment two curtains being shown carried by respectiverollers 3| to promote greater variation of adjustment to lightconditions.

The film 21 is directed through a channel 32 formed in one of theaforesaid supports 33 which are attached to the box and to a slide 34which is mounted in a slot 35 formed in the body 36 of the camera, seeFigure 14.

A magazine 81 for take up and supply film rolls 38, is secured to theslide 34 and is disposed exteriorly of the body of the camera so as tobe readily accessible for supplying and removing the film rolls. Thefilm is trained over guide rollers 39 in the magazine to enter thechannel 32 of the support 33 accurately. The slide as heretoforedescribed is movable endwise 'upon guides 40 disposed upon the innersurface of the camera body. Access to the film box to facilitatethreading of the roll film through the box may be provided in anypreferred manner.

As shown in Figure 15, the Wright camera has the correction lens llplaced nearly in the focal plane and an opening is made in the lens toreceive the film box. In the Schmidt type camera, where roll film isused, the focal plane is midway between the correcting lens and themirror and no opening is necessary in the correcting 4 lens.

In both forms of the invention a focusing ring is employed, threadedlyengaged with diametrically opposite slides to move the slides endwise,the slides being connected to radially disposed supports which areconnectedto a box at the axis of the camera for holding either plates orrolled film in addition to a shutter apron and supporting rollerstherefore.

From the above description it is thought that the construction andoperation of the invention will be fully understood without furtherexplanation.

What is claimed is:

l. The combination with a camera having a spherical reflecting mirror atthe back, of a sensitized photographic means holder intermediate thefront and rear of the camera adapted to be moved on axis of the cameraforwardly and rearwardly relatively to the mirror for focusing, afocusing ring rotatably mounted on the camera, a pair of diametricallydisposed slides on the camera, a threaded connection between the ringsand the slides for moving the slides endwise when the ring is turnedaxially, supports connecting the slides to the holder for movement as aunit with the slides, and shutter curtain means interposed between theholder and mirror.

2. The structure as of claim '1 and in which the holder is adapted tohold photographic plates, and which the camera is provided with a doorto afford access to the holder for removal and replacement of theplates.

3. The structureas of claim 1 and in which the holder is provided withguides for supportin a ribbon of sensitized film, said holder having anextension on the exterior of the camera, take up and supply rolls forrolled film in said extension.

.and guide rollers in the holder for guiding the film from said rollersto exposure position in the holder. i

4. The structure as of claim 1 and in which said focusing ring isprovided with graduations. and in which the camera is provided with anarrow coacting with the graduations.

LYLE T. JOHNSON. RAYMOND A. JENSEN.

